The correct order of ionic size of N³⁻, Na⁺, F⁻, Mg²⁺ and O²⁻ is:
- AMg²⁺ > Na⁺ > F⁻ > O²⁻ < N³⁻
- BN³⁻ O²⁻ > Na⁺ > Mg²⁺
- CMg²⁺ < Na⁺ < F⁻ < O²⁻ < N³⁻
- DN³⁻ > O²⁻ > F⁻ > Na⁺ < Mg²⁺
✓ Correct answer: C
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